You may want to try Strick trailer on Rt. 1 in Falls Twp., PA. They are just North of the Oxford Valley Mall about 2 miles. My DD and SIL use the outside storage there, but I know they have inside storeage. Have no idea of the price, but it is a fenced in area with a full time guard shack. They store a lot of over the road trucks and trailers there. It is a very large place.
DD is not home, but if you want the phone number, PM me and I'll get it for you.
1999 NEWMAR American Star (for sale)* Newmar Kountry Kklub # 19708 * THOUSAND TRAILS * 2006 Chevy 3500 Dually Dmax/Ally SOLD* Curt Q20 * Prodigy P2 *US ARMY 1965-1967 * Vietnam Veteran 1966-1967 * Life Member VFW *